Json知识总结

<script language="javascript">  
  
 function showJSON() {     
     var user =      
     {      
         "username":"andy",     
         "age":20,     
         "info": { "tel": "123456", "cellphone": "98765"},     
         "address":     
             [     
                 {"city":"beijing","postcode":"222333"},     
                 {"city":"newyork","postcode":"555666"}     
             ]     
     }             
     alert(user.username);     
     alert(user.age);     
     alert(user.info.cellphone);   
//或       user.info["cellphone"]    
     alert(user.address[0].city);     
     alert(user.address[0].postcode);     
 }   
</script>  

function showJSON() {     
    var user =      
    {      
        "username":"andy",     
        "age":20,     
        "info": { "tel": "123456", "cellphone": "98765"},     
        "address":     
            [     
                {"city":"beijing","postcode":"222333"},     
                {"city":"newyork","postcode":"555666"}     
            ]     
    }             
    user.username = "Tom";     
    alert(user.username);     
}   

    function testJson(){  
           
         var str = { "name": "Violet", "password": "character" };   //JSON类型对象  
//无引号，是JSON对象  
         alert(typeof(str));  //JSON类型  
         alert(str.password);   
  
         //alert(obj.toJSONString());    
           
          var a=50,b="xxx";  
          var arr="{id:"+a+",name:‘"+b+"‘}"; //string类型  
              //字符串拼接为可转换为JSON的String   
    
          var str2 = ‘{ "name": "Violet", "password": "character" }‘;       
//有引号，是String类型对象          
          alert(typeof(str2)); //string类型  
          var obj = eval(‘(‘ + str2 + ‘)‘);  //转换为JSON类型  
          alert(typeof(obj)); //JSON类型  
          alert(obj.name);  //Violet  
    }  
    </script>  

String listStr = "[‘apple‘,‘orange‘]";        
        //JSONArray json = JSONArray.fromObject(listStr);  
                //结果：["apple","orange"]  
        //必须用JSONArray来转，用JSONObject会出现以下错误信息：  
            // A JSONObject text must begin with ‘{‘ at character 1 of [‘apple‘,‘orange‘]  
          
        String mapStr2 = "{‘apple‘,‘orange‘}";  
        JSONObject json = JSONObject.fromObject(mapStr2);  
        //用JSONObject必须是键值对，上面会出现以下错误：  
            //Expected a ‘:‘ after a key at character 9 of {‘apple‘,‘orange‘}         
          
        String mapStr1 = "{‘age‘:30,‘name‘:‘Michael‘,‘baby‘:[‘Lucy‘,‘Lily‘]}";        
        JSONObject json2 = JSONObject.fromObject(mapStr1);  
                //{"age":30,"name":"Michael","baby":["Lucy","Lily"]}          
          
        System.out.println(json);  

//JSON转List  
        String str = "[‘apple‘,‘orange‘]";  
        JSONArray json = JSONArray.fromObject(str);  
        Collection<String> list = JSONArray.toCollection(json);  
        for (String s : list) {  
               System.out.println(s);  
        }  

var json={"status":1,"info":"u83b7u53d6u6210u529f","data":[{"id":"4","name":"u77f3u5bb6u5e84","information":"u5e02","Region_id":"3","type":"1"}]}  
var data=json.data;  
for(i=0;i<data.length;i++)  
{  
    document.write("Name:"+data[i].name+",Info:"+data[i].information+"");  
}  

var json=[{"kl_id":"2","kl_title":"Test date1","kl_content":"Test date2","kl_type":"3","id":"6"},{"kl_id":"2","kl_title":"Test1","kl_content":"Test2","kl_type":"1","id":"9"}]  
    var str = "";  
    for (var one in json)  
     {  
        for(var key in json[one])  
         {  
             str += json[one][key] + ",";  
         }  
     }  
     document.write(str);  

List list = query.list();  
List<String> excList = new ArrayList<String>();  
        if(list!=null && list.size()>0){  
            for (int i = 0; i < list.size(); i++) {  
                Object[] obj = (Object[]) list.get(i);  
                EipAnalysisServiceExc excR=new EipAnalysisServiceExc();  
                excR.setId(Long.parseLong(obj[0].toString()));  
                excR.setServiceName(obj[1]!=null?obj[1].toString():null);  
                  
                excList.add(JSONObject.fromObject(excR).toString());  
            }  
        }  
  
  
for (int i = 0; i < excList.size(); i++) {  
    JSONObject jSONObject = JSONObject.fromObject(excList.get(i));  
    EipAnalysisServiceExc exc = JSONObject.toBean(jSONObject, EipAnalysisServiceExc.class);  
        }  
  
  
/*由JSONObject.fromObject(excR)得到JSONObject对象，然后toString传输，再JSONObject.fromObject解析为JSONObject对象 
使用JSONObject.toBean(JSONObject类型,Class类型)  // 转换为对象(如自定义类对象，Map对象等) 转换为类类型 
*/